function test() {
    var i = 1;
    let a = 1;
    switch (i) {
        case 1:
            i += 1;
            break;
        case 2:
            i += 2;
            break;
        case 3:
        case 4:
            i += 4;
            break;
        default:
            i += 0;
    }
}
